EFFECTS OF VELOCITY VARIATIONS IN VENTILATED ROOM ON COMFORT, AFFECT AND COGNITIVE PERFORMANCE

摘要

In many buildings there is no cooling system apart from a ventilation system. The only remedy available to remove excess heat is to supply large quantities of cold air. This may, however cause unacceptable draught problems. There are indications that intermittent variations in velocities can be beneficial to people's perceived comfort. By introducing velocity variations we hypothesised that people's sensation of a pleasant indoor climate can be met at higher room temperatures than otherwise. The velocity variations were obtained by using commercial ventilation systems (mixing and displacement ventilation) and a ceiling fan. A between-subject design was employed in this study. The experiment lasted for 80 minutes, and the subject's perceived comfort and air quality, self-reported affect and cognitive (intellectual) performance were measured. The velocity variations did not have any effect on perceived thermal comfort. There were, however indications for an effect on perceived air quality, self-reported affect and cognitive performance.